Fixed #35270 -- Optimized model's Options._property_names.

co-authored-by: Nick Pope <nick@nickpope.me.uk>

django/db/models/options.py

@@ -1,6 +1,5 @@
 import bisect
 import copy
-import inspect
 from collections import defaultdict
 
 from django.apps import apps
@@ -969,11 +968,13 @@ def total_unique_constraints(self):
     @cached_property
     def _property_names(self):
         """Return a set of the names of the properties defined on the model."""
-        names = []
-        for name in dir(self.model):
-            attr = inspect.getattr_static(self.model, name)
-            if isinstance(attr, property):
-                names.append(name)
+        names = set()
+        for klass in self.model.__mro__:
+            names |= {
+                name
+                for name, value in klass.__dict__.items()
+                if isinstance(value, property)
+            }
         return frozenset(names)
 
     @cached_property